Method of fabricating a filter screen

Abstract

A method is provided for fixedly joining a cloth, a cloth-like fabric or a synthetic mesh to a rigid or semi-rigid hub to form a seal, which secures the cloth, the cloth-like fabric or the synthetic mesh to the hub by enclosing the edge of the material between the neck of the hub and a ring, and causing the fusing of the hub and ring through induction heating of a bonding agent The assembly is advantageously used as a filter screen in a filter press.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent is: 
     
       1. A method of making a filter screen including the steps of: providing a filter hub, having a longitudinal bore therethrough, with a channel extending longitudinally into the wall of said hub;   positioning a bonding agent mixed with a metal powder within said channel formed in the wall of said filter hub;   locating a piece of filter cloth within said channel;   positioning a press ring to cover said filter cloth and said bonding agent within said channel;   heating by induction said metal powder to bond and fixedly retain said filter cloth and said press ring in said channel.   
     
     
       2. The method of claim 1 wherein while heating said metal powder, said press ring is forced inward into said channel. 
     
     
       3. The method of claim 2 wherein said filter cloth is retained in said channel, by mechanically locking and bonding said filter cloth in said channel. 
     
     
       4. The method of claim 3 wherein said press ring pinches said filter cloth to mechanically lock said cloth in said channel. 
     
     
       5. The method of claim 1 wherein said filter hub has a circular cross section. 
     
     
       6. The method of claim 1 wherein said filter hub has a polygonal cross section. 
     
     
       7. The method of claim 1 wherein said filter hub is selected from nylon, polypropylene, or polyester. 
     
     
       8. The method of claim 1 wherein said press ring is fabricated from thermoplastic rubber. 
     
     
       9. The method of claim 1 wherein said step of heating by induction involves radiating said metal powder with RF radiation. 
     
     
       10. The method of claim 1 wherein said bonding agent is polypropylene and said metal powder is ferrous based. 
     
     
       11. A method of making a filter including the steps of: providing a filter hub having a longitudinal bore therethrough, and having a channel extending longitudinally into the wall of said hub, at each opposing end;   positioning a bonding agent mixed with a metal powder within each of said channels;   locating a piece of filter cloth corresponding to each channel within each of said channels;   positioning a press fit ring corresponding to each channel to cover each of said filter cloths and each of said bonding agents within each of said channels;   heating by induction each of said metal powders in said channels to fixedly secure and bond said filter cloths and said press rings into said channels.